Frederik mohr



(No Model.) P. MOHR.

' BRAKE FOR GUN GARRIAGES.

-\ 1&0. 500,927.

Patented July 4, 1893.

FREDERIK MOHR, OF

PATENT QFFIQE.

MAGDEBIIEG-BUOKAU, GERMANY, ASSIGNOR TO THE GRUSONWERK, OF SAME PLACE.

BRAKE FOR cuN-o AamAcEs.

SPECIFICATION forming part of Letters Patent No. 500,927, dated July 4,1893. Application filed October 6, 1892. Serial No. 447,894. (No model.)Patented in Belgium May 13, 1892, No. 99,673.

To all whom it may concern:

Be it known that I, FREDERIK'MOHR, a subject of the King of Denmark, anda resident of- Magdeburg-Buckau, in the Kingdom of Prussia, GermanEmpire, have invented certain new and useful Improvements in Brakes forGun-Carriages, (for which I have obtained Letters Patent in Belgium, No.99,67 3, dated May 13, 1892,) of which the following is a [Ospecification.

My. invention relates to a brake for guncarriages which is particularlyadapted for use upon wheeled gun-carriages.

The object of my said invention is to pro- 1 5 vide upon the guncarriage a simple and efficient brake which engages with the ground, andoffers to the recoil a resistance which is automatically proportioned sothat it may never cause the gun to jump.

According to the said invention the im proved brake has a spur, arrangedpreferably on the trail of the gun'-carrii* e set as to be forced intothe ground andincre'ase the frictional'resistance to the recoil.The{resistance is kept constant foran-y particular state of the groundby means of a'special device hereinafter fully explained.

- In order that my invention may be clearly understood I will nowproceed to describe 0 the same with reference to the accompanyingdrawings in which- Figure I is a side elevation of the end of the trailof a gun to which an improved brake according to my said invention isapplied, and Figs. II and III are longitudinal central sections throughthe ends of other trails, to which alternative forms of the saidimproved brake are applied.

Like letters indicate corresponding parts throughout the drawings.

With reference first to Fig. I, B is a spur adapted to turn upon a bolt0 fixed in the trail of the gun-carriage, and provided with an arm I). Fis a spring secured to the trail with one of its ends arranged to bearupon the arm I). f is an adjusting-screw bearing upon the other end ofthe spring, and capable of being adjusted in a suitable bearing in thetrail to vary the compression of the spring and the pressure on b. -Whenthe gun is un limbered, the spur B is forced into the ground by thatpart of the weight of gun and carriage, which rests upon the trail ofthe guncarriage. The said spur enters more or less deeply into theground according to the na- 95 ture and condition of the same and isdriven in still farther during the firing. During the recoil the spur Bcuts a furrow in the ground, the length of which represents the minimumI recoil reached under the conditions chosen. When succeeding rounds arefired this furrow is lengthened, as the shortness of the same ren dersit superfluous to run the gun up to the original position for firing.The device so far as it has been described would control the recoil uponground of a certain kind, if a fixed spur of suitable proportions werechosen. But

if a gun-carriage provided with such a fixed spur were brought uponfirmer ground, for em ample,jumping of the gun would soon occur,

in the firing, as the resistance of the spur to the recoil would exceedthe admissible limit. It

is to permit of the regulation of the resistance offered by the spur,that, as hereinbefore de= scribed it is pivoted upon the axis 0, and the7 5 power of the spring F Lsuch that in the recoil there will be aturning movement of the spur B upon the axis 0 at the moment when thepress ure of the wheels upon the ground becomes approximately nothing.When the spur B turns, So its depth of penetration decreases, and thus,also, the resistance which it ofiers to the re-' coil. Accordingly thesaid brake apparatus adjusts itself, in each case automatically, as thebrake spur turns exactly as far as the re- 8 5 sistance of the grounddemands. The wheel brakes of the gun carriage therefore becomesuperfluous for preventing recoil although they may of course beretained for other purposes. The power of the spring E which is gorequired for the purpose can be readily cal-'. culated withoutdifficulty and can moreover be regulated by the adjusting screw, whilethe most favorable dimensions of the spur B can best be determined byexperiment. In lien 5 of the spring F weights could be arranged to bearupon the spur B, but it is undesirable to increase the weight of thegun-carriage, by employing weights in this manner. As an-' otheralternative other pressure may be emroo ployed to bear upon the spur byany suitable means, If it be desired to still farther decrease therecoil at the expense of slight jumping of the gun-carriage, it is onlynecew sary to increase the compression of the spring sufficiently.

In the arrangement shown in Figs. II and III the spur, for reasonshereinafter set forth, need not be made of a length and Width to renderit suitable for use in the softest ground. With reference now to Fig. H,K a screw which bears upon a portion of the trail and passes through ablock B to which the spur is rotatably secured. By employing the saidscrew to move the block, the spur can be adjusted so that it protrudesmore or less from the trail of the gun carriage. It is thus adjustedwhen in use, thereby enabling the resistance of the ground to act upon agreater or smaller surface of the spur and its mean effective leverageto be varied.

In Fig. III is shown an arrangement in which the spur is alsoautomatically adjusted vertically according to the nature or conditionof the ground. In this modification the pin 0 on which the spur turns iscarried. by an arm or frame N arranged to turn about the second bolt Lwhich is fixed in the trail of the gun- A spring M presses upon a partof c said arm or frame. to the resistance of the ground and spring M thespur is forced 111011501 less deeply into the same. 0 is a stop by whichthe downward movement of the arm or frame is limited.

To determine the dimensions of the spur let the assumption be made thatit is entirely sunk in loose ground in a vertical position and that thegun is fired in the lowest position of depression. The resistanceoffered by the spur to the recoil of the gun must then be such thatjumping of the gun round the trail of the gun-carriage is just preventedor is confined to definite admissible limit. In general only the firstcase will have to be taken into consideration, that is to say the recoilwill be limited only to such an extent that jumping of the gun is justavoided. If this condition is fulfilled the pressure of the Wheels upontheground will be approximately ml at the moment of the firing, and thepresse gun-carriage upon the mum.

As hcreinbefore stated the construction of such improved object in thebrakes is to bring the resistanceotferod by the spur to.

in; the bouncing of the gun. The designer will have to decide first hownearly it is desirable to approach the attainable minimum of the recoil.

Having now particularly vention, what I claim isl. The combination withthe trail of agun, of a spur hinged thereon and projecting do\vn Wardfor insertion into the ground, and a spring having one end fixed and theother end adjusted to oppose the turning of said spur on its hingesubstantially for the purpose explained.

2. In a brake for a gun. carriage the combination with the trail, of ahinged spur projecting downward therefrom and suitable means foradjusting the position of the hinge on the trail, substantially as andfor the purposes specified.

3. In a brake for a gun-carriage the combination with the trail, of anarm or frame pivoted to the trail, and havinga spur projecting therefromand a spring on the trail adjusted to resist the swinging movement ofsaid arm or frame on its hinge, substantially as and for the purposesspecified.

4. in a brake for a n of the trail, a g

the trail and having an expring between said extension trail, as andforthe described my intension, and a s and a fixed portion of thepurpose specified.

5. In a brake fora gun-carriage, the combination of the trail, a pivotedspur, a spring hearing at one end upon'the spur and resisting itsswinging movement, and a screw threaded in a fixed part and engaging theother end of said spring, all substantially as and for the purposes setforth.

6. In a brake for gun-carriages the combination of the trail, thepivoted spur, means for adjustably securing the pivot of the spur on thetrail, and the spring mounted on the trail and bearing against the spur,substantially as and for the purposes set forth.

'7. In a gun-carriage the combination of the trail a frame pivoted onthe trail, a spur pivoted in said frame, a spring also carried by theframe and bearing against the spur for keeping it in vertical position,and a spring carried by the trail and bearing on the pivoted frame forholdin g it down with a yield ing pressure, all substantially as and forthe purpose set forth.

' FREDERIK MOIIR.

Witnesses:

HERMANN LUBowsKI, EMIL KALLNEoKnn.

